History and background of sun-lamps and heat-lamps from Sperti, Philips, Hanau and many others. This site is dedicated to electric substitutes for the sun. Sun-lamps, heat-lamps and light-sources, designed to simulate the natural and well-doing radiation of the sun. A sun-lamp emits ultraviolet radiation, a heat-lamp infrared radiation. A light-source emits radiation in the visible part of the...